Advertisement
3. CONNECTING THE PIPING
(1) Do not use mineral oil on flared part.
Prevent mineral oil from getting into
the system as this would reduce the
lifetime of the units.
(2) Never use piping which has been used
for previous installations. Only use parts
which are delivered with the unit.
(3) While welding the pipes, be sure to
blow dry nitrogen gas through them.
1. FLARE PROCESSING
(1) Cut the connection pipe with pipe cutters so that the
pipe is not deformed.
(2) Hold the pipe downwards so that cuttings cannot
enter the pipe, remove the burrs.
(3) Remove the flare nut from the indoor unit pipe and
outdoor unit and assemble as shown in (Table 3)
and insert the flare nut onto the pipe, and flare with
a flaring tool.
(4) Check if the flared part "L" (Fig. 15) is spread uni-
formly and that there are no cracks.
Table 3
Pipe
Small pipe
Small (width across flats 22 mm)
(9.53 mm dia)
Large pipe
Large (width across flats 24 mm)
(15.88 mm dia)
Large pipe
Large (width across flats 36 mm)
(19.05 mm dia)
Fig. 15
Width across flats
L
2. BENDING PIPES
The pipes are shaped by your hands. Be careful not to
collapse them.
Fig. 16
Extend the pipe
OK
by unwinding it.
Do not bend the pipes in an angle more than 90°.
When pipes are repeatedly bent or stretched, the
material will harden, making it difficult to bend or
stretch them any more. Do not bend or stretch the
pipes more than three times.
Flare nut
L dimension
Small pipe (9.53 mm dia)
1.8 to 2.0 mm
Large pipe (15.88 mm dia)
2.2 to 2.4 mm
Large pipe (19.05 mm dia)
2.6 to 3.0 mm
NO
When bending the pipe, do not bend it as is. The pipe
will be collapsed. In this case, cut the heat insulating
pipe with a sharp cutter as shown in Fig. 17, and bend
it after exposing the pipe. After bending the pipe as
you want, be sure to put the heat insulating pipe back
on the pipe, and secure it with tape.
Fig. 17
Heat insulating
pipe
Cutter
Cut line
3. CONNECTION PIPES
(1) Remove the filter guide (Fig. 18).
Fig. 18
Indoor unit
(2) Attach the connection pipe (Fig. 19).
Fig. 19
Indoor unit
• For w Top piping and e Right piping connections,
use the Auxiliary pipe (large pipe) provided.
Fig. 20
w Top piping
Large pipe
e Right piping
Be sure to apply the pipe against the
port on the indoor unit correctly. If the
centering is improper, the flare nut can-
not be tightened smoothly. If the flare
nut is forced to turn, the threads will be
damaged.
– 6 –
Pipe
Filter guide
Large pipe
Small pipe
Large pipe
Indoor unit (rear)
Auxiliary pipe (large pipe)
Advertisement
